<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"/>
		<title>数据类型</title>
	</head>
	<body>
		<script type="text/javascript">
		/* var a = '123';
		console.log(isNaN(a));

		var b = 0.1;
		var c = 0.6;
		console.log(b+c); */


		var a = '123456';
		var b = '7\'8\'9';
		var c = 789;
		console.log(a+b);
		console.log(a+c);
		</script>
	</body>
</html>